dal.py 文件源码

def NOT(self,first):
        nops = { self.EQ: self.NE,
                 self.NE: self.EQ,
                 self.LT: self.GE,
                 self.GT: self.LE,
                 self.LE: self.GT,
                 self.GE: self.LT}
        if not isinstance(first,Query):
            raise SyntaxError("Not suported")
        nop = nops.get(first.op,None)
        if not nop:
            raise SyntaxError("Not suported %s" % first.op.__name__)
        first.op = nop
        return self.expand(first)